A rectangle measuring 7cm by 4cm.The square cm is?

Assuming that by "square cm" you want the area of the rectangle, this can easily be calculated using the formula for the area of a rectangle:

A=Length * Width

In this case it does not matter which side is which, so we can multiply 7 * 4 which will give us 28cm^2 (cm squared).

To find the area of a rectangle, you need to multiply the length by the width. In this case, the length is 7cm and the width is 4cm. Therefore, the area of the rectangle can be calculated as:

Area = length * width
= 7cm * 4cm
= 28 square cm

So, the area of the rectangle is 28 square cm.